an example for the sweave module, prepared by Gregor Gorjanc

[lyx.git] / src / support / lstrings.cpp

diff --git a/src/support/lstrings.cpp b/src/support/lstrings.cpp
index 9f4824270bb2943ab5af3539d04a51c170872b36..7e358c940092c9bdd99dd2b576bbdec0fb343cdb 100644 (file)
--- a/src/support/lstrings.cpp
+++ b/src/support/lstrings.cpp
@@ -504,7 +504,7 @@ bool prefixIs(docstring const & a, docstring const & pre)
 
 bool suffixIs(string const & a, char c)
 {
-       if (a.empty()) 
+       if (a.empty())
                return false;
        return a[a.length() - 1] == c;
 }
@@ -928,11 +928,15 @@ docstring const escape(docstring const & lab)
 }
 
 
-docstring wrap(docstring const & str, int const ind, size_t const width)
+namespace {
+
+// this doesn't check whether str is empty, so do that first.
+vector<docstring> wrapToVec(docstring const & str, int const ind,
+                           size_t const width)
 {
        docstring s = trim(str);
-       if (s.empty()) 
-               return docstring();
+       if (s.empty())
+               return vector<docstring>();
 
        docstring indent;
        if (ind < 0)
@@ -942,31 +946,67 @@ docstring wrap(docstring const & str, int const ind, size_t const width)
                for (int j = 0; j < ind; ++j)
                        s = " " + s;
 
-       docstring retval;
+       vector<docstring> retval;
        while (s.size() > width) {
-               size_t i = width - 1;
+               int i = width - 1;
                // find the last space
                for (; i >= 0; --i)
                        if (s[i] == ' ')
                                break;
-               if (i < 0) { 
+               if (i < 0) {
                        // no space found
                        s = s.substr(0, width - 3) + "...";
                        break;
                }
-               if (!retval.empty())
-                       retval += "\n";
-               retval += s.substr(0, i);
+               retval.push_back(s.substr(0, i));
                s = indent + s.substr(i);
        }
-       if (!s.empty()) {
-               if (!retval.empty())
-                       retval += "\n";
-               retval += s;
-       }
+       if (!s.empty())
+               retval.push_back(s);
        return retval;
 }
 
+}
+
+
+docstring wrap(docstring const & str, int const ind, size_t const width)
+{
+       docstring s = trim(str);
+       if (s.empty())
+               return docstring();
+
+       vector<docstring> const svec = wrapToVec(str, ind, width);
+       return getStringFromVector(svec, from_ascii("\n"));
+}
+
+
+docstring wrapParas(docstring const & str, int const indent,
+                   size_t const width, size_t const maxlines)
+{
+       if (str.empty())
+               return docstring();
+
+       vector<docstring> pars = getVectorFromString(str, from_ascii("\n"), true);
+       vector<docstring> retval;
+
+       vector<docstring>::iterator it = pars.begin();
+       vector<docstring>::iterator en = pars.end();
+       for (; it != en; ++it) {
+               vector<docstring> tmp = wrapToVec(*it, indent, width);
+               size_t const nlines = tmp.size();
+               if (nlines == 0)
+                       continue;
+               size_t const curlines = retval.size();
+               if (maxlines > 0 && curlines + nlines >= maxlines) {
+                       tmp.resize(maxlines - curlines - 1);
+                       tmp.push_back(from_ascii("..."));
+               }
+               retval.insert(retval.end(), tmp.begin(), tmp.end());
+               if (maxlines > 0 && retval.size() >= maxlines)
+                       break;
+       }
+       return getStringFromVector(retval, from_ascii("\n"));
+}
 
 
 namespace {
@@ -1004,6 +1044,24 @@ getVectorFromStringT(String const & str, String const & delim, bool keepempty)
 #endif
 }
 
+
+template<typename String> const String
+       getStringFromVector(vector<String> const & vec, String const & delim)
+{
+       String str;
+       typename vector<String>::const_iterator it = vec.begin();
+       typename vector<String>::const_iterator en = vec.end();
+       for (; it != en; ++it) {
+               String item = trim(*it);
+               if (item.empty())
+                       continue;
+               if (!str.empty())
+                       str += delim;
+               str += item;
+       }
+       return str;
+}
+
 } // namespace anon
 
 
@@ -1023,22 +1081,17 @@ vector<docstring> const getVectorFromString(docstring const & str,
 }
 
 
-// the same vice versa
 string const getStringFromVector(vector<string> const & vec,
                                 string const & delim)
 {
-       string str;
-       vector<string>::const_iterator it = vec.begin();
-       vector<string>::const_iterator en = vec.end();
-       for (; it != en; ++it) {
-               string item = trim(*it);
-               if (item.empty())
-                       continue;
-               if (!str.empty())
-                       str += delim;
-               str += item;
-       }
-       return str;
+       return getStringFromVector<string>(vec, delim);
+}
+
+
+docstring const getStringFromVector(vector<docstring> const & vec,
+                                   docstring const & delim)
+{
+       return getStringFromVector<docstring>(vec, delim);
 }